Emergency signalling sleeve



FIG. 1 is a perspective view of an emergency signalling sleeve of this invention, with the broken line showing for illustrative purpose only and forming no part of the claimed design;

FIG. 2 is a top view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a left-hand side view thereof;

FIG. 5 is a back view thereof;

FIG. 6 is a right-hand top view thereof; and,

FIG. 7 is a bottom view thereof. 

The ornamental design for an emergency signalling sleeve, as shown and described. 